<<Contents>> <<Index>>
General
Specifications
Model PR300
Power and Energy Meter
GS 77C01E01-01E
■ Overview
This panel-mounted power and energy meter with a
large, three-row LED display integrates all the measuring functions required for power management in
locations such as factories and buildings into a single
unit.
With the objective of working toward the preservation
of the global environment by saving energy and
performing equipment maintenance, the PR300 is
designed to display and output the energy of various
types of electrical equipment.
■ Features
• Saves on cost, wiring, and space
Integrates a wide selection of functions for measuring things
like energy (active, regenerative, reactive, and apparent),
power (active, regenerative, reactive, and apparent),
voltage, current, frequency, and power factor into a single
unit.
• Employs a large, three-row LED display
Capable of displaying three-phase current and voltage
simultaneously, and the measurement items you assign.
• Analog output function
Equipped with a transducer function for power (active,
regenerative, reactive, and apparent), voltage, current,
frequency, and power factor (4 to 20 mA DC).
• Demand measurement
Measures the average power and current within a specified
period. It also allows you to set up alarm points to output
alarms.
• Equipped with a multitude of functions
Enables measurement of the maximum and minimum
values of voltage and the maximum value of current, as well
as, for example, the use of external digital input to measure
energy at arbitrary times.
• Pulse output
Capable of outputting pulses proportional to energy (one
measurement item from active, regenerative, reactive, and
apparent energy).
• Converts the phase and wire system of an AC power
system and an input voltage circuit to a universal
format
The PR300 can handle from the single-phase two-wire
system and single-phase three-wire system to the threephase three-wire system and three-phase four-wire system,
and also universally cope with input voltage circuits up to
600 V AC.
• Compatible with ANSI 4-inch round form size and
DIN 96-square instrument size
The ability to attach and detach JIS/ANSI-mounting kit
makes the PR300 compatible with panel cutouts of ANSI 4inch round form, JIS 110-square instrument size, and DIN
96-square instrument size.
• Standard equipped with an RS-485 communication
function and capable of Ethernet communication
• Compatible with overseas requirements
Power line indications A, B, and C provided for overseas
use, in addition to R, S, and T
Under application for UL approval
ANSI 4-inch round form size
DIN 96-square instrument size
The ability to attach and detach JIS/ANSI-mounting kit
ensures compatibility with two sizes.
■ Model and Suffix Codes
-0
PR300
Model
Phase and wire system
3: Universal three-phase three-wire system
(single-phase two-wire, single-phase three-wire,
and three-phase three-wire systems)
4: Universal three-phase four-wire system
(single-phase two-wire, single-phase
three-wire, three-phase three-wire, and
three-phase four-wire systems)
5: Three-phase four-wire system
(2.5 element)*1
Input voltage/input current
1: Universal voltage input*2
(150 V, 300V, 600 V) / 1 A AC
2: Universal voltage input*2
(150 V, 300 V, 600 V) / 5 A AC
Additional input and output function
0: 1 digital input
1: 1 digital input, 1 analog output
2: 1 digital input, 1 pulse output
3: 1 digital input, 1 analog output, 1 pulse output
Communication function
0: RS-485 communication
3: RS-485 communication, Ethernet communication*3
Optional measuring function
0: None
3: Demand measurement (1 demand alarm output)
Power supply
6: 100-240 V AC 10% (50/60 Hz) or 130-300 V DC 15%
Phase indication format
A: A, B, and C indications
R: R, S, and T indications
*1 Can be used only when the voltage is in a state of equilibrium.
The phase and wire system cannot be changed.
*2 Set the voltage range (150 V, 300 V, or 600 V) according to the
rated input voltage to be measured. (Refer to “Rated Input
Voltage” of the Input Specifications on page 6.)
*3 For Ethernet communication, the RS-485 communication interface
is exclusively for the Ethernet-serial gateway function.
■ Ordering Information
Specify the model and suffix codes.
Example: PR300-31000-6A-0
GS 77C01E01-01E
©Copyright Feb. 2006
1st Edition Feb. 2006
2
<<Contents>> <<Index>>
■ Measuring Functions
Measurement item
Demand current *2
Active energy ()
*1
Active energy ()
*1
Reactive energy () *1
Reactive energy () *1
Apparent energy
*1
Optional active energy *1
Instantaneous
Active power
Maximum
Minimum
Instantaneous
Reactive power Maximum
Minimum
Instantaneous
Apparent power Maximum
Minimum
Instantaneous
Voltage-1
Maximum
Minimum
Instantaneous
Voltage-2
Maximum
Minimum
Instantaneous
Voltage-3
Maximum
Minimum
Instantaneous
Current-1
Maximum
Instantaneous
Current-2
Maximum
Instantaneous
Current-3
Maximum
Instantaneous
Frequency
Maximum
Minimum
Instantaneous
Power factor
Maximum
Minimum
Demand
Demand current-1
Maximum
Demand
Demand current-2
Maximum
Demand
Demand current-3
Maximum
Demand
*2
Demand power Maximum
Single-phase Single-phase Three-phase Three-phase Three-phase
Unit and
Remarks
four-wire system
two-wire
three-wire
three-wire
four-wire
symbol
system
system
system
system
(2.5 element) *3
✔
✔
✔
✔
✔
kWh, MWh
✔
✔
✔
✔
✔
kWh, MWh Regenerative energy
✔
✔
✔
✔
kvarh, Mvarh
LAG: *4
✔
✔
✔
✔
kvarh, Mvarh LEAD: *4
✔
✔
✔
✔
kVAh, MVAh
*4
✔
✔
✔
✔
✔
Wh
✔
✔
✔
✔
✔
W, kW, MW
✔
✔
✔
✔
*4
var, kvar, Mvar
✔
✔
✔
✔
*4
VA, kVA, MVA
✔
✔
✔
✔
✔
V, kV
✔
✔
V, kV
✔
✔
✔
V, kV
✔
✔
✔
✔
*4
A, kA
✔
✔
A, kA
✔
✔
*4
A, kA
✔
✔
✔
✔
✔
Hz
✔
✔
✔
✔
*4
COS
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
*4
*4
A
A
A
A
A
A
kW
kW
*4
*4
✔
✔
*1 Integrated low-cut power can be set for each energy.
Integrated low-cut power: This is a function for not integrating power less than a set value as energy.
The setting range of integrated low-cut power is 0.05 to 20.00% of the rated power (initial value: 0.05%).
*2 Either demand power or demand current can be set as a measurement item.
*3 Can be used only when the voltage is in a state of equilibrium.
*4 Can be measured only when the current is in a state of equilibrium.
All Rights Reserved. Copyright © 2006, Yokogawa Electric Corporation
GS 77C01E01-01E
Calculated from the
voltage-1
LAG: LEAD: ✔: Effective
: Ineffective
1st Edition Feb.13, 2006-00
3
<<Contents>> <<Index>>
● Optional integrating function
Power is integrated while a control signal for optional integration is on.
When the control signal is switched from off to on, the optional integrated value indication is reset and integration
starts. (The integrated value prior to the reset is held in a register.) The integrated value cannot be guaranteed in
the event of a power failure occurring during integration.
● Demand measurement (when demand measurement is specified)
The PR300 measures average power or average current within a set demand period.
The maximum demand value for the demand measuring time is held until the power is turned off, remote reset is
executed, or the next demand measurement is started.
Item
Demand power/current
Demand period
Demand alarm mask time*
Demand power alarm point
Demand current alarm point
Alarm release function
Data update interval
Setting Range
Active power, current
1 to 60 minutes
(Demand alarm mask time to 60 minutes)
1 minute to length of demand period
1 to 1000 kW
1 to 1000 A
Automatic release and
manual release
10 seconds
Resolution
Initial Value
Active power
1 minute
30 minutes
1 minute
1 kW
1A
1 minute
100 kW
100 A
Automatic
release
Remarks
Demand alarm mask time ⬉ Demand period
When demand power is selected
When demand current is selected
* This is the time from the start of the demand period to the set time in which no judgment is made for the alarm (alarm masked). During the
alarm mask time, no maximum demand value is updated and no alarm is output.
Start
demand
measument
Stop
demand
measument
Demand period (1 period)
Average power Average power
(current) update (current) update
Demand measuring time
The maximum demand value for this time is held.
All Rights Reserved. Copyright © 2006, Yokogawa Electric Corporation
GS 77C01E01-01E
1st Edition Feb.13, 2006-00
4
<<Contents>> <<Index>>
■ Display and Operation Specifications
(6)
(7)
(8)
(9)
(1)
(10)
(5)
(11)
(2)
(3)
Upper display
Middle display
(4)
Lower display
(12)
(1)
Measured
Value Display
5-digit, 3-row, 7-segment LED display
Display color: red
Measured Value display:
Measurement Item
Display
Active energy
[kWh, MWh]
*1
Reactive energy
[kvarh, Mvarh]
*2
Apparent energy
[kVAh, MVAh]
*1
Regenerative energy
[kWh, MWh]
*2
Optional active energy
[Wh]
Active/regenerative power (instantaneous, maximum, and minimum values)
[W, kW, MW]
*2, *3
Reactive power (instantaneous, maximum, and minimum values)
[var, kvar, Mvar]
*2, *3
Apparent power (instantaneous, maximum, and minimum values)
[VA, kVA, MVA]
*1, *3
Voltage (instantaneous, maximum, and minimum values)
[V, kV]
*1, *3
Current (instantaneous and maximum values)
[A, kA]
*2, *4
LEAD: d
[COS␾]
Power factor (instantaneous, maximum,
*3
and minimum values)
LAG: G
[COS␾]
Frequency (instantaneous, maximum, and minimum values)
[Hz]
*3
Demand power
[kW] [DEMAND]
*4
Maximum demand power
Demand current
[A] [DEMAND]
*4
Maximum demand current
*1: Without sign, but with a decimal point
*2: With a sign and a decimal point ("+" is not indicated). Regenerative power (energy) always shows negative indication.
The position of a decimal point differs depending on the primary rated power, VT ratio, and CT ratio.
*3: "MAX" lights up for the maximum value and "MIN" lights up for the minimum value.
*4: "MAX" lights up for the maximum value.
Measured Value screen:
Display pattern: The measurement items you want to display are assigned to each of the upper, middle, and lower displays
to provide indications using three display rows as one pattern. Up to eight display patterns can be set.
The initial values are as shown in the following table. (Combinations other than those shown in the
following table are also available if the parameters are set.)
Number of display patterns: Can be set in the range of 1 to 8. Pressing the SET/ENT key switches the display from
"display pattern-1," "display pattern-2," and so on in order according to the number of patterns set. The
initial value is "1" and only display pattern 1 is displayed when this value is set.
Display Pattern-1 Display Pattern-2 Display Pattern-3 Display Pattern-4 Display Pattern-5
Current
Upper
(Phase switch Active power Active energy Current-1
Voltage-1
display
indication)*
Voltage
Middle
Reactive LAG reactive
(Phase switch
Current-2
Voltage-2
display
energy
power
indication)*
Lower
Apparent
Active power Power factor
Current-3
Voltage-3
energy
display
<Continued on the
following page>
Display Pattern-6 Display Pattern-7 Display Pattern-8
Current
Current
(Phase switch (Phase switch Active power
indication)*
indication)*
Voltage
Maximum
(Phase switch Active power
demand value
indication)*
Demand
Frequency Power factor
value
* The display of current (phase switch indication) is switched between current-1, current-2, and current-3 each time the SEL key is
pressed. The display of voltage (phase switch indication) is switched between voltage-1, voltage-2, and voltage-3 each time the SEL key
is pressed.
All Rights Reserved. Copyright © 2006, Yokogawa Electric Corporation
GS 77C01E01-01E
1st Edition Feb.13, 2006-00
5
<<Contents>> <<Index>>
(2)
(3)
(4)
VT ratio/CT ratio:
If the VT ratio and CT ratio are set, input to the PR300 is displayed after converting it to the primary input value before VT
or CT. The VT and CT ratios can be set via communication or using the operation keys.
VT ratio setting range: 1 to 6000*
CT ratio setting range: 0.05 to 32000*
* Set the VT ratio and CT ratio so that [secondary rated power] [VT ratio] [CT ratio] is smaller than 10 GW.
Unit Lamps
The relevant unit lamp lights up according to a measurement item and measured value.
Display color: red
MAX and MIN Lamps Either the MAX or MIN lamp lights up when a maximum or minimum measured value is displayed.
Display color: red
Phase Indication Lamps Indicate the phase to which the measured value corresponds. (The A, B, and C indications or R, S, and T indications
should be specified in accordance with the suffix code.)
Display color: red
Phase and Wire System
Single-phase two-wire system
Single-phase three-wire system
Three-phase three-wire system
Three-phase four-wire system
Three-phase four-wire system
(2.5 element)
Voltage-1
A (R)
A, B (R, S)
A, B (R, S)
A (R)
Voltage-2
−
B, C (S, T)
−
Voltage-3
−
−
B, C (S, T)
Current-2
−
C (T)
Current-1
A (R)
A (R)
A (R)
A (R)
B (S)
B (S)
C (T)
C (T)
A (R)
−
C (T)
A (R)*
−
C (T)*
C (T)
−
Current-3
−
−
* Can be measured only when the current is in a state of equilibrium.
(5)
Power Lamp
Lights up when power is supplied.
Blinks (4 times/sec) until it returns to normal when the communication error occurs.
Display color: green
(6) Communication Lamp Blinks during communication (RS-485 or Ethernet).
Display color: green
(7) Pulse Output Lamp Lights up when output is produced during pulse output, and goes out when no output is produced.
Display color: green
(8) Demand Alarm Lamp If a demand value exceeds the demand alarm point at a time other than during the alarm mask time, the OVER lamp
lights up to indicate the occurrence of an alarm.
Display color: red
(9) Phase and Wire
The lamps of the phase and wire system that have been set light up.
System Lamps
Display color: green
(10) Input Range Lamps The input voltage range (150 V, 300 V, or 600 V) and input current range (1 A or 5 A) that have been set light up.
Display color: green
(11) DEMAND Lamp
Lights up when a demand value is displayed.
Display color: red
Used to switch measured value display patterns.
(12) Operation Keys
This key is also used for setting parameters.
Used to adjust the display digit during energy indication.
This key is also used for setting parameters.
Used to display the maximum or minimum measured value.
These keys are also used for setting parameters.
Used to switch phase indications when the PR300 displays a voltage or current for which phase indication can be
changed. (Phase switch indication is not available for single-phase two-wire system.)
This key is also used for setting parameters.
Used to start/stop demand measurement.
The lamp in the key lights up during demand measurement. Display color: green
Indicator-out Mode Setting
This function turns off LEDs after a certain time elapses, with the exception of the power lamp (LED).
The ON/OFF setting of the indicator-out mode function and the wait time before entering the indicator-out mode can
be set using the operation keys. (Cannot be set via communication.)
Indicator-out mode: ON/OFF (initial value: OFF)
Indicator-out mode wait time: 1 to 60 minutes (resolution: 1 minute) (initial value: 10 minutes)
A/D Sampling Rate,
Data Update Interval
A/D sampling rate: 4.8 kHz
Internal measurement data: display/communication data is updated at an interval of 1 second or less
All Rights Reserved. Copyright © 2006, Yokogawa Electric Corporation
GS 77C01E01-01E
1st Edition Feb.13, 2006-00
6
<<Contents>> <<Index>>
■ Input Specifications
Phase and Wire
System
Frequency
• Universal three-phase three-wire system (switch the setting from single-phase two-wire system, single-phase three-wire
system, or three-phase three-wire system)
• Universal three-phase four-wire system (switch the setting from single-phase two-wire system, single-phase three-wire
system, three-phase three-wire system, or three-phase four-wire system)
• Three-phase four-wire system (2.5 element)
45 to 65 Hz
Rated Input Voltage
Rated Input Current
Rated Input Power
and Measuring
Range
(Secondary side of
VT and CT if VT and
CT are used)
Rated Voltage
120 V
240 V
480 V
Voltage Range (Variable)
150 V
300 V
600 V
Rated Current
Current Range (Fixed)
1A
1A
5A
5A
Allowable Input Voltage
150 V
300 V
600 V
Allowable Input Current
1.2 times the current range (continuous)
Twice the current range (10 seconds) or
10 times the current range (3 seconds)
• Single-phase three-wire system
• Single-phase two-wire system
Input (AC)
Rated
Power
120 V / 1 A
120 V / 5 A
240 V / 1 A
240 V / 5 A
480 V / 1 A
480 V / 5 A
Input
Measuring
Range
Approximate
Consumed VA
Voltage Current
Side
Side
100 W 120 to 120 W
500 W 600 to 600 W 0.2 VA
200 W 240 to 240 W
0.4 VA
1000 W 1200 to 1200 W
400 W 480 to 480 W
0.8 VA
2000 W 2400 to 2400 W
Rated
Power
120 V / 1 A
120 V / 5 A
240 V / 1 A
240 V / 5 A
480 V / 1 A
480 V / 5 A
Input
Measuring
Range
Input
Measuring
Range
0.2 VA
• Three-phase three-wire system
Input (AC)
Approximate
Consumed VA
Rated
Voltage Current
Power
Side
Side
240 V / 1 A 200 W 240 to 240 W 0.2 VA/ 0.2 VA/
240 V / 5 A 1000 W 1200 to 1200 W phase phase
Input (AC)
• Three-phase four-wire system
Approximate
Consumed VA
Voltage Current
Side
Side
0.2 VA/
phase
0.4 VA/ 0.2 VA/
phase phase
200 W 240 to 240 W
1000 W 1200 to 1200 W
400 W 480 to 480 W
2000 W 2400 to 2400 W
800 W 960 to 960 W 0.8 VA/
4000 W 4800 to 4800 W phase
Input (AC)
Rated
Power
120 V / 1 A
120 V / 5 A
240 V / 1 A
240 V / 5 A
480 V / 1 A
480 V / 5 A
300 W
1500 W
600 W
3000 W
1200 W
6000 W
Input
Measuring
Range
Approximate
Consumed VA
Voltage Current
Side
Side
0.2 VA/
phase
0.4 VA/ 0.2 VA/
phase phase
360 to 360 W
1800 to 1800 W
720 to 720 W
3600 to 3600 W
1440 to 1440 W 0.8 VA/
7200 to 7200 W phase
• Input measuring range if VT and CT are used
The primary input power is smaller than 10 GW and the value calculated by the following equation is within the
input measuring range mentioned above.
Input measuring range (W) =
Primary input power (W)
VT ratio CT ratio
■ Digital Input Specifications
For digital input, either the optional integration start/stop or the demand alarm release can be used.
If demand measurement is specified for an optional measuring function, digital input enters demand alarm release
status. In this case, the optional integration start/stop cannot be used.
● Control signal for optional integration
Function
Starts or stops optional integration.
Number of Inputs
1
Input Signal
Voltage signal*
ON signal: 4.5 to 25 V DC
OFF signal: within 1 V DC
* A special order can be placed for no-voltage contact.
Note: Optional integration control is also possible via communication.
Once control is performed via digital input, only digital input-based control is available. Communication-based control is no longer
possible until the power is turned off or remote reset is executed.
● Demand alarm release (when demand measurement is specified)
Function
Cancels demand alarm.
Number of Inputs
1
Input Signal
Voltage signal*
ON signal:4.5 to 25 V DC
OFF signal: within 1 V DC
* A special order can be placed for no-voltage contact.
All Rights Reserved. Copyright © 2006, Yokogawa Electric Corporation
GS 77C01E01-01E
1st Edition Feb.13, 2006-00
7
<<Contents>> <<Index>>
■ Analog Output Specifications (When Analog Output is Specified)
Function
Measurement Item for Output
Output Signal
Output Accuracy
Allowable Load Resistance
Response speed
Setting Item
Upper and Lower Limits
of Scaling Setting
Range for
Each Measurement Item
for Output
Converts measurement data into DC current for output.
One item selected from active power, reactive power, apparent power, voltage (1 to 3), current (1 to 3),
power factor, and frequency
4 to 20 mA DC
Measurement accuracy of measurement item for output (0.5% of F.S.)
0 to 600 2 seconds or less (until 1% of the final value is reached)
Measurement item for output and the upper and lower limits of scaling.
Initial value: active power (W), lower limit of scaling: 50% (0 W), upper limit of scaling: 100% (maximum value of
the input measuring range W)
Scaling setting condition: upper limit of scaling lower limit of scaling ⭌ 50%
Active power
rated power (W) to rated power (W)
Reactive power rated power (var) to rated power (var)
Apparent power 0 to rated power (VA)
Voltage (1 to 3) 0 to rated voltage (V)
Current (1 to 3) 0 to rated current (A)
Power factor
0.5 to 1 to 0.5
Frequency
45 to 65 (Hz)
■ Pulse Output Specifications (When Pulse Output is Specified)
Function
Measurement Item for Output
Number of Outputs
Output Signal
Contact Capacity
Pulse Unit
Setting Item
ON Pulse Width
Outputs pulses proportional to energy.
One item selected from active energy, regenerative energy, reactive energy (LEAD, LAG), and apparent energy
1
Open collector
30 V DC at 200 mA
0.1 to 5000.0 kWh/pulse* (set in 100 Wh increments)
Measurement item for output, pulse unit, and ON pulse width
Initial value: active energy (kWh), pulse unit: 1 kWh/pulse, and ON pulse width: 50 ms
Represents the ON time of pulses to be output. (Set the pulse width so that the maximum ON pulse width obtained
by the following equation is not exceeded.)
Within the range of 10 to 1270 ms (set in 10 ms increments)
Maximum ON pulse width (ms) =
Pulse unit [kWh/pulse]* 3600 10002
Secondary rated power [W] VT ratio CT ratio 1.2 2
* The units are kvarh/pulse for reactive energy and kVAh/pulse for apparent energy.
■ Demand Alarm Output Specifications (When Demand Measurement is
Specified)
Function
Output Signal
Contact Capacity
Alarm Release Function
Outputs an alarm if the measured demand value exceeds the set demand alarm point.
Open collector
30 V DC at 200 mA
Automatic release: Cancels the alarm if demand falls below the demand alarm point when the next measurement is
performed. Manual release*: Holds the status of an alarm that occurred once. Cancel the alarm via digital input or
communication, or using the operation keys.
* Refer to “Demand alarm release” of the Digital Input Specifications.
All Rights Reserved. Copyright © 2006, Yokogawa Electric Corporation
GS 77C01E01-01E
1st Edition Feb.13, 2006-00
8
<<Contents>> <<Index>>
■ Communication Specifications
● RS-485 communication
Example:
PC
Maximum communication distance: 1200 m
Maximum number of slave stations to be connected: 31
Station number 01
Function
Protocol
Transmission Distance
Connection Method
Station Number
Transmission Method
Synchronization Method
Baud Rate
Xon/Xoff Control
Data Format
Station number 02
Station number 31
RS-485 communication enables you to use the command response method to read a variety of measurements and
write various settings.
PC link (with checksum, without checksum), Modbus (RTU, ASCII)
Approx. 1200 m maximum (when 24 AWG twisted-pair cable is used)
Multi-drop connection (a maximum of 32 units [including a higher-level device])
01 to 99 (maximum number of units to be connected: 31 [number of units that can be connected to a PC etc.])
(Setting range: 01 to 31 is recommended)
Half-duplex communication
Start-stop synchronization
19200, 9600, and 2400 bps
None
Data length
8 bits, 7 bits
Parity
None, even, odd
Stop bit
1 bit, 2 bits
For details, refer to the user’s manual for communications of each device to be connected.
Example of Connection Diagram
Approx. 1200 m maximum (31 units maximum)
RS-232C
straight
cable
ML2
PR300
PR300
PR300
Converter
(Yokogawa)
(A) (B) (SG)
PC
120⍀ (built-in)
RS-485
(A) (B) (SG)
RS-485
(A) (B) (SG)
(TERM) (A) (B) (SG)
RS-485
*
* 120 Ω (external resistor)
Use the external resistor
without using the built-in
resistor of ML2.
Terminator
(FG)
Notes:
The PR300 employs a two-wire system for RS-485 communication.
SG: The SG terminal is connected to match the signal level of the RS-485 communication line.
FG: All shielded wires must be connected and then grounded at one place to provide noise protection for
RS-485 communication lines.
All Rights Reserved. Copyright © 2006, Yokogawa Electric Corporation
GS 77C01E01-01E
1st Edition Feb.13, 2006-00
9
<<Contents>> <<Index>>
● Ethernet communication (when the Ethernet communication function is specified)
Example:
PC
IP address: 192.168.1.1
HUB
Ethernet
LAN
connection
Station number 01
IP address: 192.168.1.2
Function
Communication
Specifications
IP Address
Modbus/TCP
Function
Overview of
Modbus/TCP
Protocol
Station number 01
IP address: 192.168.1.3
Station number 01
IP address: 192.168.1.4
Station number 01
IP address: 192.168.1.5
Ethernet communication enables you to use the command response method to read
a variety of measurements and write various settings.
The PR300 can be connected to IEEE802.3 compliant networks
Application layer
(10BASE-T/100BASE-TX).
Transport layer
Higher-level device (PC etc.)
MODBUS/TCP
Network layer
TCP, UDP
IP, ICMP, ARP
Data link layer
Physical layer
Ethernet
10BASE-T/100BASE-TX
Protocol
Modbus/TCP
Access Control
CSMA/CD
Baud Rate
10Mbps/100Mbps
Maximum Segment Length
100 m (distance between the hub and module)
Maximum of 4 levels of cascading (for 10BASE-T) or maximum of 2 levels of cascading (for 100BASE-TX)
Maximum Connecting
Configuration
(Number of hubs that can be cascade connected)
IP addresses can be set using the operation keys on the front of the PR300.
Code
Function
Description
03
Reads data from multiple D registers
Capable of reading data from up to 64 registers continuously.
06
Writes data into D register
Capable of writing data into one register.
08
Performs loopback test
Capable of performing a communication test.
16
Writes data into multiple D registers
Capable of writing data into up to 32 registers continuously.
The Modbus/TCP protocol is configured as follows:
PDU (Simple Protocol Data Unit) is
MBAP Header
Function code
Data
the same as Modbus/RTU (serial
PDU
communication based Modbus protocol).
The MBAP header (Modbus Application Protocol Header) contains the following seven bytes:
Byte No
Description
0
1
Transaction ID
2
3
Protocol ID
4
5
6
Number of bytes
Unit ID
Transaction ID: Set any value for identifying the transaction. The PR300 returns a value received from a higher-level device as a response.
Protocol ID: Specify "0" for the Modbus/TCP protocol.
Number of bytes: Number of bytes after the unit ID (byte number 6)
Unit ID: The PR300 returns a value received from a higher-level device as a response.
EthernetSerial Gateway
Function
The PR300 has an RS-485 communication terminal in
addition to an Ethernet communication connector.
Modbus/TCP commands received by Ethernet are relayed
to the RS-485 terminal. This enables the PR300 to connect
to a device with an RS-485 communication function
(Modbus/RTU protocol) via a network.
RS-485 communication
Protocol
Modbus/RTU
Baud Rate
9600 bps
Parity
Even, odd, or none
Stop Bit
1 bit
Data Length
8 bits
Example:
Higher-level device
IP address: 192.168.1.1 (arbitrary)
Ethernet
10BASE-T/100BASE-TX
PR300
(with Ethernet communication
function)
Station number 01 (fixed)
IP address: 192.168.1.2
(arbitrary)
RS-485 connection
Device with RS-485 serial
communication function
Power Monitor of POWERCERT series
Digital indicating controller of
GREEN series
Signal conditioner of JUXTA series
Station number 02
(arbitrary)
Station number 10
(arbitrary)
For details, refer to the user’s manual for communications of each device to be connected.
Note: If Ethernet communication is used, the RS-485 communication interface is used specifically for the Ethernet-serial gateway function.
Therefore, it is not possible for a higher-level device such as a PC to access the PR300 via the RS-485 communication interface.
All Rights Reserved. Copyright © 2006, Yokogawa Electric Corporation
GS 77C01E01-01E
1st Edition Feb.13, 2006-00
10
<<Contents>> <<Index>>
■ Standard Performance
Accuracy Rating
Calculation Accuracy
Backup upon Power Failure
Insulation Resistance
Withstand Voltage
Impulse Withstand Voltage
Effects of Magnetic Field
Effects of Changes in Ambient
Temperature
Effects of Power Supply Voltage
Variations
Effects of Input Frequency
Dustproof and Dripproof
Power Supply
Power Consumption
Active energy/optional active energy (Wh)
0.5% (EN60687 accuracy: class 0.5 or equivalent)
0.5% of F.S.
Active power (W)
0.25% of F.S. (voltage rms)
Voltage (V)
0.25% of F.S. (current rms)
Current (A)
0.5Hz
Frequency (Hz)
0.5%
Demand
The value is calculated to an accuracy of 1 digit from the measured value for reactive energy, apparent energy,
reactive power, apparent power, power factor or current*.
* Current is only for the 2.5 element measurement.
The last integrated values obtained immediately before the power failure are held for active energy,
regenerative energy, reactive energy, and apparent energy.
100 M⍀ or more (at 500 V DC)
Between each of the voltage input, current input, power,
ground, digital input, pulse output, analog output,
communication output, and alarm output terminals
2500 V AC for one minute
Between each of the voltage input, current input, power, and
ground terminals:
2500 V AC for one minute
Between (the voltage input, current input, power and ground
terminals) and the digital input, pulse output, analog output,
alarm output, RS-485 communication output, and Ethernet
communication output terminals:
Between each of the digital input, pulse output, analog output, 1000 V AC for one minute
alarm output, and (RS-485 communication output, Ethernet
communication output) terminals:
500 V AC for one minute
Between the RS-485 communication output, and Ethernet
communication output terminals:
Between all of the voltage input, current input, and power terminals and the ground terminal:
Between all of the output and ground terminals and all of the voltage input and current input terminals:
6 kV (1.2/50␮s), 10 times for positive and negative
Within accuracy range at 400 A/m or less
0.01%/°C for a temperature change rate of 10°C/h or less (when 0.05 In ≤ I ≤ I max, power factor = 1)
0.02%/°C for a temperature change rate of 10°C/h or less (when 0.1 In ≤ I ≤ I max, power factor = LAG 0.5)
In: rated current, I: present current input
0.05% for variations within the power supply operating range (when 0.01 In and power factor = 1)
In: rated current
0.1% for a variation of 5% (when power factor = 1 and LAG 0.5)
IP5X
100-240 V AC 10% (50/60 Hz) or 130-300 V DC 15%
AC drive: 10 VA maximum, DC drive: 5 W maximum
■ Safety and EMC Standards
Safety Standards
Measurement category
Compliant with IEC/EN61010-1
Under application for UL61010 approval
600V CAT. III
Measurement Category
Pollution degree
Rated measurement input voltage
EMC-compliant Standards
Description
Remarks
CAT.I
Circuits not directly connected to main power supply
CAT.II
Circuits directly connected to low-voltage facility
Home-use equipment, portable tools, etc.
CAT.III
Circuits in building facilities
Switchboards, circuit breakers, etc.
CAT.IV
Supply sources to low-voltage facilities
Overhead lines, cable systems, etc.
2 (IEC/EN61010)
600V AC (between terminals)
Compliant with EN61326
During testing, the instrument continues to operate at a measurement accuracy within the range of 20%.
All Rights Reserved. Copyright © 2006, Yokogawa Electric Corporation
GS 77C01E01-01E
1st Edition Feb.13, 2006-00
11
<<Contents>> <<Index>>
■ Environmental Conditions
Normal Operating Conditions
Warm-up time
At least 30 minutes
0 to 50°C (reference temperature: 23 2°C)
Ambient temperature
10°C/h or less
Temperature change
20 to 90% RH (no condensation)
Ambient humidity
400 A/m or less
Magnetic field
10 to 60 Hz, 0.035 mm, 75 minutes
Continuous vibration
60 to 150 Hz, 4.9 m/s2, 75 minutes
14.7 m/s2 for 15 seconds or less
Short-time vibration
98 m/s2 or less (for shock time of 11 ms)
Shock
Vertical surface mounting only
Mounting position
2000 m or less
Installation altitude
Effects on Operating Conditions
Effects of ambient
temperature
Analog output: 0.05% of F.S./°C or less
Effects on supply
voltage variations
Analog output: 0.05% of F.S./°C or less
Transport and Storage Conditions
20 to 70°C
Temperature
5 to 95% RH (no condensation)
Humidity
■ Power Items and Equations
(V and A are rms values)
Phase and Wire
Syatem
Power
Apparent Power Reactive
(without using reactive Power Factor
power meter method)
VA= VA
Single-phase
two-wire system
Single-phase
three-wire
system
Three-phase
three-wire
system
VAi= ViAi
i=1, 2
⌺VA= VA1+VA2
Q= ((VA)2P2)
Q= ((VAi)2Pi2)
i= 1, 2
⌺Q = Q1+Q2
((VAi)2Pi2)
Q=
VAi= ViAi
i= 1, 3
i= 1, 3
⌺VA= 3 /2(VA1+VA3) ⌺Q = Q1+Q3
⌺P / ⌺VA
(without using
reactive
power meter
method)
VAi= ViAi
Q= ((VAi)2Pi2)
Three-phase
i= 1, 2, 3
four-wire system i=1, 2, 3
⌺VA= VA1+VA2+VA3 ⌺Q = Q1+Q2+Q3
VAi= ViAi
Q= ( 3 /2(VAi)2Pi2)
Three-phase
i= 1, 3
i= 1, 3
four-wire system
(2.5 element)
⌺VA= 3 /2(VA1+VA3) ⌺Q = Q1+Q3
* For distorted wave input, there may be differences between the PR300 and a
measuring instrument that uses a different measurement principle.
Shock and dropping of 90 cm (provided that an external packing
box is used)
package
■ Initial Settings (Time of Shipment)
The PR300 has the following initial settings at the
time of shipment. Settings can be modified after
delivery.
Initial Value
Three-phase three-wire system
(for three-phase three-wire system)
Phase and wire system
Three-phase four-wire system
(for three-phase four-wire system)
Voltage range
300 V
VT ratio/CT ratio
1 / 1.00
0.05 %
Integrated low-cut power
01
Station number
PC link with checksum
Protocol
9600 bps
Baud rate
None
Parity
1 bit
Stop bit
8 bits
Data length
192.168.1.1
IP address *1
502
Port number *1
255.255.255.0
Subnet mask *1
0.0.0.0
Default gateway *1
Measurement item for pulse output Active energy (kWh)
1 kWh/pulse
Pulse unit
50 ms
ON pulse width
Measurement item for analog output Active power (W)
50% (0 W)
Lower limit of scaling
100% (maximum value of the
Upper limit of scaling
input measuring range W)
Active power
Demand power/current
30 minutes
Demand period
1 minute
Demand alarm mask time
100 kW
Demand power alarm point
100 A
Demand current alarm point
Automatic release
Alarm release function
Indicator-out mode/indicator-out
Other mode wait time
Off/10 minutes
Demand
Measurement *4
Analog
Output *3
Pulse
Output *2
Communication
Input
Setting Item
*1 When the Ethernet communication function is specified
*2 When pulse output is specified
*3 When analog output is specified
*4 When demand measurement is specified
All Rights Reserved. Copyright © 2005, Yokogawa Electric Corporation
■ Mounting and Shape
Casing: polycarbonate resin (PC), UL94 V-0
Terminal block: polybutylene terephthalate (PBT),
UL94 V-0
Terminal cover: polyamide resin (PA6), UL94 V-2
Panel mounting (refer to Panel Cutout
Mounting Method
Dimensions)
Connection Method Use of M3 screws for terminal connections:
analog output, pulse output, demand alarm output,
digital input, and RS-485 communication
Use of M4 screws for terminal connections:
voltage/current input and power supply
RJ45 connection: Ethernet communication
External Dimensions 110(H) 110(W) 128(D) mm or
(including a terminal cover) 96(H) 96(W) 126(D) mm
Weight
Approx. 600 g (when the accessories such as
mounting bracket are attached)
Materials
■ Accessories
JIS/ANSI-mounting kit
DIN-mounting bracket
Dust cover (with a screw)
Terminal cover (with screws)
Shorting bar (for RS-485 communication termination)
Tag number label
1 set
2
1
1
1
2
■ Related Products (Optionally Available)
Product Name
Model
CTW130
CTW100
CTW35
Clamp-on current transformer
CTW20
CTW15
CTW10
CTU100
Separate type transformer
CTU20
CTU10
GS 77C01E01-01E
Description
800A/5A
500A/5A
300A/1A
200A/1A
100A/1A
100A/1A
500A/5A
200A/1A
100A/1A
1st Edition Dec.30, 2005-00
12
<<Contents>> <<Index>>
■ Connection Diagrams
A phase and wire system can be selected by specifying the parameters.
If measurement input does not exceed 600 V AC or 5A AC, direct input without using a VT or CT is possible. Do not
ground the input circuit when a VT or CT is not used.
● Single-phase two-wire system
Pulse output
13
Power-source side
1
2
14 Analog output
11
Contact capacity:
30V DC, 200mA
Output signal:
4 to 20mA DC
12
RS-485 communication*1
17 TERM
18
19
20
1
1S
K k
CT
L l
1L
2
4
U
u
Fuse
V VT v
P1
P2
6
3
5
7
11
12
13
14
15
16
8
18
20
23
Screws marked with ● are an essential part
of the structure. For safety reasons, do not
touch them.
16
ALM
PE
Optional integration control signal
or demand alarm release*2
Contact capacity:
30V DC, 200mA
(resistive load)
*1: If Ethernet communication is used, the RS-485 communication
interface is used specifically for the Ethernet-serial gateway function.
*2: If demand measurement is specified, the demand alarm release is selected.
All Rights Reserved. Copyright © 2006, Yokogawa Electric Corporation
25
N Power supply
LED
Demand alarm output
ALM
15
CAUTION
.
Operating range:
100-240V AC 10% or
130-300V DC 15%
LED
Load side
18
25
22
10
RS-485
B
SG
Power supply
L
23
24
24
21
9
A
When terminating on wiring,
short-circuit terminals 17 and
17
19
R: 120⍀ (built-in)
R
21
D/I
22
D/I
Voltage signal
ON signal: 4.5 to 25V DC
OFF signal: within 1V DC
Ethernet communication
RJ45 connector
10BASE-T/100BASE-TX
Link LED (top)
Color Description
Off
Stopped
Orange 10Mbps
Green 100Mbps
Active LED (bottom)
Color Description
Off
Stopped
Orange Half duplex
Green Full duplex
Switching between 10BASE-T and100BASE-TX takes place automatically.
Switching between half duplex and full duplex takes place automatically.
GS 77C01E01-01E
1st Edition Feb.13, 2006-00
13
<<Contents>> <<Index>>
● Single-phase three-wire system
Pulse output
13
Power-source side
1
N
2
14
Analog output
11
Contact capacity:
30V DC, 200mA
12
Output signal:
4 to 20mA DC
RS-485 communication*1
17 TERM
18
19
20
K k
CT
L l
1
1S
1L
2S
2L
k
CT
L l
K
U
Fuse
V
V
u
2
4
6
P1
P0
P2
v
v
3
5
7
11
12
13
14
15
16
8
24
24
25
25
LED
LED
Load side
Demand alarm output
ALM
15
CAUTION
Screws marked with ● are an essential part
of the structure. For safety reasons, do not
touch them.
16
ALM
SG
18
.
N Power supply
PE
Operating range:
100-240V AC 10% or
130-300V DC 15%
22
10
U VT u
23
21
9
RS-485
B
Power supply
L
23
18
20
A
When terminating on wiring,
short-circuit terminals 17 and
17
19
R: 120⍀ (built-in)
R
Contact capacity:
30V DC, 200mA
(resistive load)
*1: If Ethernet communication is used, the RS-485 communication
interface is used specifically for the Ethernet-serial gateway function.
*2: If demand measurement is specified, the demand alarm release is selected.
Optional integration control signal
or demand alarm release*2
21
D/I
22
D/I
Voltage signal
ON signal: 4.5 to 25V DC
OFF signal: within 1V DC
Ethernet communication
RJ45 connector
10BASE-T/100BASE-TX
Link LED (top)
Color Description
Off
Stopped
Orange 10Mbps
Green 100Mbps
Active LED (bottom)
Color Description
Off
Stopped
Orange Half duplex
Green Full duplex
Switching between 10BASE-T and100BASE-TX takes place automatically.
Switching between half duplex and full duplex takes place automatically.
● Three-phase three-wire system
Pulse output
13
Power-source side
1
2
3
14 Analog output
11
Contact capacity:
30V DC, 200mA
Output signal:
4 to 20mA DC
12
RS-485 communication*1
17 TERM
18
A
B C
(R) (S) (T)
19
20
K k
CT
L l
1S
1L
3S
3L
k
CT
L l
K
U
Fuse
V
V
u
v
v
U VT u
P1
P2
P3
1
2
4
6
3
5
7
11
12
13
14
15
16
8
18
20
23
24
21
10
16
ALM
Contact capacity:
30V DC, 200mA
(resistive load)
*1: If Ethernet communication is used, the RS-485 communication
interface is used specifically for the Ethernet-serial gateway function.
*2: If demand measurement is specified, the demand alarm release is selected.
All Rights Reserved. Copyright © 2006, Yokogawa Electric Corporation
24
.
25
N Power supply
PE
Optional integration control signal
or demand alarm release*2
Demand alarm output
ALM
15
Screws marked with ● are an essential part
of the structure. For safety reasons, do not
touch them.
18
Power supply
L
23
LED

CAUTION
SG
Operating range:
100-240V AC 10% or
130-300V DC 15%
LED
Load side
RS-485
B
25
22
9
A
When terminating on wiring,
short-circuit terminals 17 and
17
19
R: 120⍀ (built-in)
R
21
D/I
22
D/I
Voltage signal
ON signal: 4.5 to 25V DC
OFF signal: within 1V DC
Ethernet communication
RJ45 connector
10BASE-T/100BASE-TX
Link LED (top)
Color Description
Off
Stopped
Orange 10Mbps
Green 100Mbps
Active LED (bottom)
Color Description
Off
Stopped
Orange Half duplex
Green Full duplex
Switching between 10BASE-T and100BASE-TX takes place automatically.
Switching between half duplex and full duplex takes place automatically.
GS 77C01E01-01E
1st Edition Feb.13, 2006-00
14
<<Contents>> <<Index>>
● Three-phase four-wire system
Pulse output
13
Power-source side
N
1
2 3
14 A B C
(R) (S) (T)
Analog output
11
Contact capacity:
30V DC, 200mA
Output signal:
4 to 20mA DC
12
RS-485 communication*1
17 TERM
18
19
20
1S
1L
2S
2L
3S
3L
P1
P0
P2
K k
CT
L l K k
CT
L l K
k
CT
L
l
Fuse
U
u
V
v
U
V
u
v
u
U
1
2
4
6
3
5
7
11
12
13
14
15
16
8
17
23
19
24
20
24
25
21
ALM
PE
LED
Optional integration control signal
or demand alarm release*2
Demand alarm output
ALM
15
16
.
N Power supply
Operating range:
100-240V AC 10% or
130-300V DC 15%
V VT v
Screws marked with ● are an essential part
of the structure. For safety reasons, do not
touch them.
18
25
22
LED
CAUTION
RS-485
B
SG
Power supply
L
23
18
9
Load side
A
When terminating on wiring,
short-circuit terminals 17 and
10
P3
R: 120⍀ (built-in)
R
Contact capacity:
30V DC, 200mA
(resistive load)
*1: If Ethernet communication is used, the RS-485 communication
interface is used specifically for the Ethernet-serial gateway function.
*2: If demand measurement is specified, the demand alarm release is selected.
21
D/I
22
D/I
Voltage signal
ON signal: 4.5 to 25V DC
OFF signal: within 1V DC
Ethernet communication
RJ45 connector
10BASE-T/100BASE-TX
Link LED (top)
Color Description
Off
Stopped
Orange 10Mbps
Green 100Mbps
Active LED (bottom)
Color Description
Off
Stopped
Orange Half duplex
Green Full duplex
Switching between 10BASE-T and100BASE-TX takes place automatically.
Switching between half duplex and full duplex takes place automatically.
● Three-phase four-wire system (2.5 element)
Pulse output
13
Power-source side
2 3
N
1
14
A B C
(R) (S) (T)
Analog output
11
Contact capacity:
30V DC, 200mA
12
Output signal:
4 to 20mA DC
RS-485 communication*1
17 TERM
18
19
20
K k
CT
L l K k
CT
L l K
k
CT
L
l
Fuse
U
u
v
v
V
V
u
U
1S
1L
2S
2L
3S
3L
P1
P0
P3
1
2
4
6
3
5
7
11
12
13
14
15
16
8
18
20
24
Screws marked with ● are an essential part
of the structure. For safety reasons, do not
touch them.
16
ALM
24
Contact capacity:
30V DC, 200mA
(resistive load)
.
25
N Power supply
PE
Optional integration control signal
or demand alarm release*2
*1: If Ethernet communication is used, the RS-485 communication
interface is used specifically for the Ethernet-serial gateway function.
*2: If demand measurement is specified, the demand alarm release is selected.
All Rights Reserved. Copyright © 2006, Yokogawa Electric Corporation
18
Power supply
L
23
LED
Demand alarm output
ALM
15
CAUTION
SG
Operating range:
100-240V AC 10% or
130-300V DC 15%
LED
VT
RS-485
B
25
22
10
Load side
23
21
9
A
When terminating on wiring,
short-circuit terminals 17 and
17
19
R: 120⍀ (built-in)
R
21
D/I
22
D/I
Voltage signal
ON signal: 4.5 to 25V DC
OFF signal: within 1V DC
Ethernet communication
RJ45 connector
10BASE-T/100BASE-TX
Link LED (top)
Color Description
Off
Stopped
Orange 10Mbps
Green 100Mbps
Active LED (bottom)
Color Description
Off
Stopped
Orange Half duplex
Green Full duplex
Switching between 10BASE-T and100BASE-TX takes place automatically.
Switching between half duplex and full duplex takes place automatically.
GS 77C01E01-01E
1st Edition Feb.13, 2006-00
15
<<Contents>> <<Index>>
■ External Dimensions
● ANSI 4-inch round form size (when a bezel is attached)
Unit: mm
110
(126.5)
104.5
Dust cover
22
2
(109)
1.5
110
109
Terminal cover
Bezel
(for ANSI-mounting)
23
2-M5
1 to 10
(Acceptable panel thickness for mounting)
<Panel Cutout Dimensions>
ANSI
42.9±0.4
42.9±0.4
(1.688±0.015) (1.688±0.015)
Unit: mm
(approx. inch)
ø101.6
(ø4.000)
42.9±0.4
(1.688±0.015)
42.9±0.4
(1.688±0.015)
ø7.9
(ø0.312)
Multiple Mounting
130 min.
(5.118 min.)
117 min.
(4.606 min.)
Normal Allowable Deviation= ±(Value of JIS B 0401-1999 tolerance grade IT18)/2
All Rights Reserved. Copyright © 2005, Yokogawa Electric Corporation
GS 77C01E01-01E
1st Edition Dec.30, 2005-00
16
<<Contents>> <<Index>>
● DIN 96-square instrument size
Unit: mm
(124.5)
110
12.3
96
112.2
(109)
1.5
Dust cover
Terminal cover
96
109
1 to 10
(Acceptable panel
Mounting bracket
thickness for mounting)
2 places
<Panel Cutout Dimensions>
Unit: mm
92
+0.8
0
(38)
92 +0.8
0
(25)
Min. 117
Min. 130
Normal Allowable Deviation= ±(Value of JIS B 0401-1999 tolerance grade IT18)/2
All Rights Reserved. Copyright © 2005, Yokogawa Electric Corporation
Subject to change without notice.
GS 77C01E01-01E
1st Edition Dec.30, 2005-00